有兩個數 已知它們的和是3 成積為20/9,則此兩數相差多少?

2016-01-02 6:56 am

回答 (1)

2016-01-02 7:06 am
設兩個數相差 2d > 0, 則
(3/2 + d)(3/2 - d) = 20/9
9/4 - d² = 20/9
d² = 1/36
d = 1/6
此兩數相差 2d = 1/3.


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